Build Process:
- Basically followed the vanilla guide step by step (thanks to all that worked on it!). I didn't go with the recovery only options for gibmacos, it didn't seem to download the full baseinstall.dmg file
- Used the vanilla config.plist (https://github.com/AMD-OSX/AMD_Vanilla)
- The new Clover apparently uses a different folder structure that was a little confusing. There is no more drivers64UEFI folder. I manually created it on the install USB stick
and it still worked fine.
- For the EFI folder on the install drive, I left the folder structure as is.
- Initially completed the build with a Quadro K5200, the swapped in the RX 580.
- To be honest and surprised, this build was somehow easier and smoother than my last Intel hackintosh (3770K with BioStar TZ77XE).
- Changed SMBIOS to MacPro5.1 to enable the Preview and that stuff to work.
- Sound did not initially work. Changed the ID to 7 and worked.

What's working:
- All the normal basic stuff seems fine
- All benchmarks are on par with what is expected for this CPU
- Sleep/Reboot/Power-off all fine
- I don't use any of the Apple cloud products, so I don't know about iMessages and iCloud, handoff, etc. The app store seems to work fine, let's me log in and download something.
- Front panel and rear USB all seem to be working as expected.

Not working:
- "About this Mac" window shows Unknown CPU
- RX580 OpenCL performance is slow, as reported by many others. There is an ongoing thread looking into correcting the patches (viewtopic.php?f=55&t=8927) - Awesome job by Shanee and everyone else in this community.
- Recently I've noticed that when I put the Hack to sleep, when I wake it, it does not bring up the display. The monitor seems to receive a signal but the stays blank. I have to pull the HDMI cable out of the GPU, then plug it back in for the display to come back. But when the display only goes to sleep after the 15min time out I set, it comes back alive fine when I click the mouse or keyboard.
- Has anyone noticed this issue?
- Although it recognizes the monitor as an LG QHD of some type, max refresh rate available in display preferences is 99.88Hz.
- I'm going to test if setting the refresh rate to a standard value like 60Hz will help with the wake issues, cause I sometimes have issues on my Windows machine too. But that is on a Vega 56 card. Maybe the FreeSync and high refresh rate setting are causing weird glitches.

Wich version are you trying to boot? I could not boot 10.14.6 installer, only previous versions.
Alson, have you configured clover for installing on your USB?
I followed these instructions from https://vanilla.amd-osx.com/: